/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.sparql.service.enhancer.impl.util;

import org.apache.jena.graph.Node;
import org.apache.jena.sparql.expr.ExprEvalTypeException;

public class NodeUtilsExtra {
    public static Number getNumberOrNull(Node node) {
        Number result = null;
        if (node != null) {
            Object obj = node.getLiteralValue();
            if (!(obj instanceof Number)) {
                throw new ExprEvalTypeException("Not a number");
            }
            result = ((Number)obj);
        }

        return result;
    }

    public static Number getNumberOrDefault(Node node, Number fallback) {
        Number result = getNumberOrNull(node);
        if (result == null) {
            result = fallback;
        }
        return result;
    }
}
